NWIPB OpenIR
Root size and soil environments determine root lifespan: evidence from an alpine meadow on the Tibetan Plateau
Wu, Yibo1,2; Deng, Yongcui2; Zhang, Jing2; Wu, Jing2; Tang, Yanhong3; Cao, Guangmin4; Zhang, Fawei4; Cui, Xiaoyong2; Cui, XY (reprint author), Univ Chinese Acad Sci, Coll Life Sci, Beijing 100049, Peoples R China.
2013-05-01
发表期刊ECOLOGICAL RESEARCH
ISSN0912-3814
卷号28期号:3页码:493-501
文章类型Article
摘要We used a minirhizotron system to investigate the influence of three major factors-root morphology, root depth, and season of root emergence-on root survivorship and longevity in a Kobresia humilis meadow on the Tibetan Plateau during the growing season of 2009. Root longevity was assessed by survival analysis, Kaplan-Meier analysis, and Cox proportional hazards regression. Root longevity was correlated positively with root diameter. A 17.5 % decrease in the risk of mortality was associated with a 0.1-mm increase in diameter. Roots distributed in the top 10 cm of the soil had significantly shorter longevities than roots at greater depths, with a 48 % decrease of mortality risk for each 10-cm increase in soil depth from the surface to 40 cm. Of all the factors examined, the season of root emergence had the strongest effect on root lifespan. Roots that emerged in May and June had shorter longevity than roots that emerged later in the year, and roots that emerged in September and October were more likely to survive over winter. Our findings indicated that life-history traits of roots in K. humilis meadows are highly heterogeneous, and this heterogeneity should be considered when modeling the contribution of roots to carbon and nitrogen fluxes in this type of meadow ecosystem. Moreover, temporal, spatial, and compositional variations in root longevity must be considered.; We used a minirhizotron system to investigate the influence of three major factors-root morphology, root depth, and season of root emergence-on root survivorship and longevity in a Kobresia humilis meadow on the Tibetan Plateau during the growing season of 2009. Root longevity was assessed by survival analysis, Kaplan-Meier analysis, and Cox proportional hazards regression. Root longevity was correlated positively with root diameter. A 17.5 % decrease in the risk of mortality was associated with a 0.1-mm increase in diameter. Roots distributed in the top 10 cm of the soil had significantly shorter longevities than roots at greater depths, with a 48 % decrease of mortality risk for each 10-cm increase in soil depth from the surface to 40 cm. Of all the factors examined, the season of root emergence had the strongest effect on root lifespan. Roots that emerged in May and June had shorter longevity than roots that emerged later in the year, and roots that emerged in September and October were more likely to survive over winter. Our findings indicated that life-history traits of roots in K. humilis meadows are highly heterogeneous, and this heterogeneity should be considered when modeling the contribution of roots to carbon and nitrogen fluxes in this type of meadow ecosystem. Moreover, temporal, spatial, and compositional variations in root longevity must be considered.
关键词Minirhizotron Alpine Meadow Root Lifespan Survival Analysis Seasonal Dynamics
WOS标题词Science & Technology ; Life Sciences & Biomedicine
关键词[WOS]NORTHERN HARDWOOD FORESTS ; LONGLEAF PINE FOREST ; FINE ROOTS ; NITROGEN AVAILABILITY ; NUTRIENT CONTENTS ; ELEVATED CO2 ; TURNOVER ; DYNAMICS ; ECOSYSTEMS ; TREES
收录类别SCI
语种英语
WOS研究方向Environmental Sciences & Ecology
WOS类目Ecology
WOS记录号WOS:000318569100013
引用统计
被引频次:18[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://210.75.249.4/handle/363003/3947
专题中国科学院西北高原生物研究所
通讯作者Cui, XY (reprint author), Univ Chinese Acad Sci, Coll Life Sci, Beijing 100049, Peoples R China.
作者单位1.Ningbo Univ, Coll Architectural Civil Engn & Environm, Ningbo 315211, Zhejiang, Peoples R China
2.Univ Chinese Acad Sci, Coll Life Sci, Beijing 100049, Peoples R China
3.Natl Inst Environm Studies, Tsukuba, Ibaraki 3058569, Japan
4.Chinese Acad Sci, Northwest Plateau Inst Biol, Xining 810001, Peoples R China
推荐引用方式
GB/T 7714
Wu, Yibo,Deng, Yongcui,Zhang, Jing,et al. Root size and soil environments determine root lifespan: evidence from an alpine meadow on the Tibetan Plateau[J]. ECOLOGICAL RESEARCH,2013,28(3):493-501.
APA Wu, Yibo.,Deng, Yongcui.,Zhang, Jing.,Wu, Jing.,Tang, Yanhong.,...&Cui, XY .(2013).Root size and soil environments determine root lifespan: evidence from an alpine meadow on the Tibetan Plateau.ECOLOGICAL RESEARCH,28(3),493-501.
MLA Wu, Yibo,et al."Root size and soil environments determine root lifespan: evidence from an alpine meadow on the Tibetan Plateau".ECOLOGICAL RESEARCH 28.3(2013):493-501.
条目包含的文件 下载所有文件
文件名称/大小 文献类型 版本类型 开放类型 使用许可
Root size and soil e(524KB) 开放获取CC BY-NC-SA浏览 下载
个性服务
推荐该条目
保存到收藏夹
查看访问统计
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[Wu, Yibo]的文章
[Deng, Yongcui]的文章
[Zhang, Jing]的文章
百度学术
百度学术中相似的文章
[Wu, Yibo]的文章
[Deng, Yongcui]的文章
[Zhang, Jing]的文章
必应学术
必应学术中相似的文章
[Wu, Yibo]的文章
[Deng, Yongcui]的文章
[Zhang, Jing]的文章
相关权益政策
暂无数据
收藏/分享
文件名: Root size and soil environments determine root lifespan_ evidence from an alpine meadow on the Tibetan Plateau.pdf
格式: Adobe PDF
此文件暂不支持浏览
所有评论 (0)
暂无评论
 

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。